de CT-ART 2.0 - 4.0 - 6.0 -80 and chess king is one of the most great app for de any level of chess player's and de best. if you want to find the best app of this is de chess king. CT-ART's and the chess king have de android version and the windows version. I think you will need de chess king or de CT-ART! I have some books for the chess puzzles like chess endgame training berne Rosen or 1001 brilliant ways to checkmate or test your chest IQ.